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Hey guys, I wanted to run something by you for opinions before taking action. About a year and a half ago I took my bike (03 636) in to a local shop to get a set of sprockets and a chain put on as well as get a new rear tire mounted. Stock gearing is 15/40, I took in a 14/39 pair. Logically, this -1/-1 combo should be roughly equivalent to a +0/+1.5 or +0/+2 setup (the logic being that one tooth down in the front is equivalent to 2 or 3 up in the rear).
For the first time today, I went out with a big group, we all gassed up at the same time, all reset our trip odometers. After a 20 mile ride back, we all compared numbers. Everyone was at 20.7 give or take a tenth, I was at 20.1! (under, not over as expected!)
I went and checked, and sure enough the front sprocket is still the old 15 tooth. Now I know the shop might have made an honest mistake and I realize it took me a long time to notice, but I still feel like they owe me something (at least the front sprocket that I paid for that's sitting at their shop).
What would you do in this situation?
Also, despite regularly cleaning and lubing my chain, it has already developed a kink at the master link after just about 5k miles. I heard that if it happens at the master it is due to being improperly crimped (which would also be something they did)